Heat conduction cable assembly for heat conduction of circuit cabin in ultra-high temperature environment

Abstract

The invention discloses a heat-conducting cable assembly for heat conduction of a circuit cabin in an ultra-high temperature environment, which comprises a plurality of heat-conducting cables, and each heat-conducting cable is provided with a heat-conducting plate and a pair of heat-conducting cable joints; a heat-conducting cable joint at one end of the heat-conducting plate is fixedly connected with a heating element in the circuit cabin; a heat-conducting cable joint at the other end of the heat-conducting plate is fixedly connected with the drill collar wall closest to the heating element; the heat conduction plate is of a multi-layer structure and is provided with a plurality of layers of heat conduction pieces, and the multiple layers of heat conduction pieces are stacked and fixed to form the heat conduction plate so as to meet different heat conduction rate requirements. The connecting and fixing mode of the heat conduction cable and the heating area, the heat dredging path, the structure of the heat conduction cable and the like are designed, so that rapid dredging of the heat generated during working of the underground measurement-while-drilling element is achieved, and the technology enables the device to be in the industry leading position in the technical field of measurement-while-drilling of well drilling in the ultra-high-temperature environment.

Description

Technical Field

[0001] The present invention relates to the fields of ultra - deep well drilling for oil and gas and geothermal well drilling, and particularly to a heat conduction cable assembly for heat conduction of a circuit cabin in an ultra - high temperature environment. Background Art

[0002] With the development of onshore oil and gas resource exploration and development towards the ultra - deep layer, the depth of oil and gas drilling continues to increase, and the operating environment temperature also rises accordingly. Especially for 10,000 - meter deep wells, the bottom - hole temperature can reach 240°C. Affected by the harsh ultra - high temperature environment at the bottom hole, the risk of failure or even damage of the measurement - while - drilling (MWD) instruments near the drill bit has increased significantly. Existing downhole tools and measurement instruments are difficult to meet the requirements of ultra - high temperature drilling.

[0003] The ultra - high temperature environment downhole severely restricts the safe and efficient drilling of ultra - deep layer oil and gas resources. And due to limitations in technologies such as materials, it is difficult to achieve a comprehensive technological breakthrough in the short term. To ensure the smooth progress of ultra - deep layer oil and gas drilling operations and ensure that the downhole near - bit measurement - while - drilling instruments can work safely and stably without failure or damage, it is necessary to timely conduct heat dissipated during the operation of the measurement - while - drilling instruments. Therefore, developing high - thermal - conductivity materials for the circuit electronic components of the MWD instruments in the drill collar circuit cabin and timely conducting the heat generated by the circuit board and each electronic component to the drill collar wall is of great significance for preventing the component working temperature from being too high and further ensuring the safety, timeliness, and accuracy of downhole parameter measurement.

[0004] Regarding problems such as failure and damage of measurement - while - drilling instruments during downhole high - temperature environment drilling operations, the existing technical solutions mainly focus on carrying out research on the high - temperature resistance performance of electronic components to increase the temperature - bearing limit of electronic components to adapt to a higher temperature environment; reducing the temperature of the drilling fluid at the drilling inlet to reduce the fluid temperature at the bottom hole to a certain extent, thereby reducing the external environment temperature where the measurement - while - drilling instrument is located; developing new materials for drill pipes to reduce the thermal conductivity of the annulus fluid and the fluid inside the drill pipe and reduce the heat flowing into the fluid inside the drill pipe to reduce the environment temperature at the measurement - while - drilling position near the drill bit. The above technical solutions are all passive cooling solutions, with severely limited cooling capabilities and unpredictable cooling effects. For related technologies for active cooling of measurement - while - drilling instruments, there are currently no related products on the market. Summary of the Invention

[0005] To solve the above problems, the present disclosure provides an overall design of a heat conduction cable tool that can quickly conduct the heat dissipated during the operation of downhole measurement - while - drilling equipment in an ultra - high temperature environment. The heat conduction cable tool is composed of a connector, a fixing device, and a heat conduction plate, and can be used for distributed heat source heat conduction. It has low requirements for the working environment, installation space, and weight, and can be effectively applied to environments where active cooling means such as air cooling and liquid cooling cannot be used.

[0006] To this end, the present invention provides a heat conduction cable assembly for heat conduction of a circuit cabin in an ultra-high temperature environment, including a plurality of heat conduction cables. Each heat conduction cable has a heat conduction plate and a pair of heat conduction cable connectors. The heat conduction cable connector at one end of the heat conduction plate is fixedly connected to a heating element in the circuit cabin. The heat conduction cable connector at the other end of the heat conduction plate is fixedly connected to the drill collar wall closest to the heating element. Among them, the heat conduction plate is a multi-layer structure with a plurality of heat conduction sheets, and the multi-layer heat conduction sheets are stacked and fixed to form the heat conduction plate to meet different heat conduction rate requirements.

[0007] Furthermore, the heat conduction rate of a single heat conduction sheet is ≥1000W / mK.

[0008] Furthermore, the heat conduction plate is a flexible plate with a special-shaped structure.

[0009] Furthermore, the heat conduction cable further includes a fixing device, and the fixing device is thermal glue or high thermal conductivity silicone grease. The heat conduction cable is fixed to the heating element or the circuit board where the heating element is located through the thermal glue.

[0010] Furthermore, the heat conduction cable further includes a fixing device, and the fixing device is a bolt. The heat conduction cable is connected to the circuit board in the circuit cabin through the bolt.

[0011] Furthermore, the length of the heat conduction plate is the shortest distance between the corresponding heating element and the drill collar wall.

[0012] Furthermore, the heat conduction plate is a flexible heat conduction plate containing graphene material.

[0013] Compared with the prior art, the present disclosure has the following advantages:

[0014] The present disclosure designs the connection and fixing method of the heat conduction cable to the heating area, the heat conduction path, the structure of the heat conduction cable, etc., so as to realize the rapid conduction of the heat generated by the measurement tool during operation. This technology will enable the present invention to be in the leading position in the field of measurement-while-drilling technology for ultra-high temperature environment drilling.

[0015] The overall design of the heat conduction cable tool for dissipating the heat generated by the measurement-while-drilling instrument in an ultra-high temperature environment involved in the present invention mainly covers the structure and connection method of the heat conduction cable that can achieve rapid, efficient, and continuous dissipation of the heat generated by the measurement-while-drilling instrument during the drilling process of ultra-deep, extra-deep, and geothermal wells. It plays a crucial role in ensuring the normal operation of the measurement-while-drilling equipment in an ultra-high temperature environment and further realizing the efficient measurement of the wellbore parameters during the drilling of ultra-deep and extra-deep wells. The heat conduction cable with the present invention as the core can achieve rapid dissipation of the heat generated by the wellbore measurement-while-drilling equipment in an ultra-high temperature environment during the drilling process, avoid the occurrence of accidents where the measurement-while-drilling system fails due to heat accumulation in the circuit cabin, help on-site engineering personnel timely obtain drilling parameters, understand the downhole situation, and provide support for timely adjusting the wellbore parameters or the performance of downhole fluids.

[0016] By expanding the application scenarios of the heat conduction cable tool, it can cover the fields of ultra-deep and extra-deep well and geothermal well drilling, achieve safe and efficient measurement of downhole parameters, avoid the failure of downhole measurement instruments due to the influence of ultra-high temperature environment, affect the acquisition of downhole real-time measurement parameters, and further realize safe and reliable drilling operations. At the same time, this heat conduction cable tool can enable conventional / high-temperature measurement-while-drilling equipment to meet the requirements of ultra-high temperature drilling, provide technical reserves for future deep-earth drilling above ten thousand meters, help on-site engineering personnel and scientific research personnel accurately and timely obtain wellbore parameters of ten thousand meters, judge downhole working conditions, reasonably handle downhole complexities, or carry out relevant scientific research work in combination with accurate downhole data.

[0017] Other features and advantages of the present invention will be described in the subsequent specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained by the structures pointed out in the specification, claims, and drawings. Brief Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the heat dissipation path planning of the measurement-while-drilling instrument in an ultra-high temperature environment of the present invention;

[0020] Figure 2 It is a schematic diagram of the cabin body, circuit board, heating element, and heat conduction cable of the measurement-while-drilling instrument of the present invention;

[0021] Figure 3It is a schematic diagram of the internal structure of the circuit cabin of the drilling instrument with a hole-digging groove and the position relationship of the heat-conducting cable of the present invention;

[0022] Figure 4 It is a schematic diagram of the position relationship between the heating elements inside the circuit cabin of the drilling instrument and the heat conducting cables of the circuit board of the present invention;

[0023] Figure 5 It is a schematic diagram of the overall structure of the heat conducting cable of the present invention;

[0024] Description of reference numerals:

[0025] 10. Heat conducting cable; 20. Circuit compartment body; 30. Circuit board; 40. Hot end; 50. Cold end; 11. Heat conducting cable joint; 12. Fixing device; 13. Heat conducting plate; 21. Circuit compartment bolt hole; 22. Circuit compartment groove; 23. Circuit board placement groove; 31. Heating element. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figures 1 to 5 As shown, the thermal cable assembly for heat conduction in a circuit cabin in an ultra-high temperature environment of the present invention includes a plurality of thermal cables 10, wherein the thermal cables 10 have a thermal cable joint 11, a fixing device 12 and a thermal conductive plate 13, and can be used for heat conduction of distributed heat sources, and has low requirements on the working environment, installation space and weight, and can be effectively applied to environments where active cooling methods such as air cooling and liquid cooling cannot be used.

[0028] Specifically, the entire thermal cable 10 is connected to the heating element 31 in the circuit compartment in a distributed manner, and the other end is connected to the drill collar wall area closest to the heating element 31 to ensure that the thermal resistance of the thermal cable 10 is minimized and the thermal conductivity of the thermal cable 10 is maximized.

[0029] For example, the fixing device 12 is thermal glue or high thermal conductive silicone grease, and the thermal cable 10 is fixed on the heating element 31 or on the circuit board 30 where the heating element 31 is located through the thermal glue.

[0030] The fixing device 12 may also be a bolt, and the thermal cable 10 is connected to the circuit board 30 in the circuit compartment via the bolt.

[0031] The heat conduction plate 13 of the heat conduction cable 10 is connected to the connectors at both ends of the heat conduction plate 13. The connector at the hot end 40 of the heat conduction cable 10 can be fixed and connected to the circuit board 30 or the heating element 31 through bolts or thermal glue. The heat conduction cable 10 is connected to the circuit board 30 in the circuit cabin through bolts to form the hot end 40, and the heat on the circuit board 30 is transferred to the cold end 50 of the drill collar wall.

[0032] Among them, the heat conduction plate 13 is a multi-layer structure with several layers of heat conduction fins. The heat conduction rate of a single-layer heat conduction fin is ≥1000W / mK, which can achieve rapid heat conduction; the heat conduction flux of the heat conduction cable 10 can be designed according to the actual application scenario. According to the heat conduction rate requirement, by stacking and fixing multiple heat conduction plates 13, a higher heat conduction rate can be achieved to meet the strict requirements of actual engineering; the number of layers of the heat conduction plates 13 on the heat conduction cable 10 can be stacked according to the heat quantity requirement to increase the heat conduction rate of the heat conduction cable 10 and expand the heat conduction capacity of the heat conduction cable 10.

[0033] The heat conduction cable 10 can be customized in special shapes and flexibly connected according to the specific application space scenario. The shape of the heat conduction cable 10 can be designed as needed and the heat conduction plates 13 on the heat conduction cable 10 can be twisted (the number of bendable times ≥50000 times) to fix the heat flow path, so that the heat conduction cable 10 can adapt to complex heat conduction channels, small spaces and other areas to meet higher application requirements; the heat conduction cable 10 can be designed with special-shaped processing in combination with the specific shape and structure of the drill collar circuit cabin and the circuit board 30. In the narrow space in the circuit cabin, by bending the heat conduction plates 13 on the heat conduction cable 10, the heat conduction cable 10 is connected to the drill collar wall in a non-coplanar manner.

[0034] The entire heat conduction cable 10 is made of non-magnetic materials and will not interfere with the measurement-while-drilling instruments working in the circuit cabin; the components of the heat conduction cable 10 are all processed by metal metallurgy technology, and the processing technology is simple; all components of the heat conduction cable 10 are made of low-density materials, reducing the weight burden of the overall system. The plate material of the heat conduction plate 13 in the heat conduction cable 10 is selected as flexible graphene material. This heat conduction plate 13 has the characteristics of large heat conduction flux, low density, excellent heat spreading performance, simple design, etc., and can fully release the performance of the heat conduction cable 10.

[0035] The heat conduction cable 10 can be fixed on the heating element 31 through materials such as thermal glue, or fixed on the circuit board 30 where the heating element 31 is located. The direct fixing method of the heat conduction cable 10 to the heating chip / element is the main heat conduction method. The distributed heat source heat conduction method is adopted. By cutting the heat conduction plate 13, one end is fixedly connected to each heating element 31, and the other end is fixedly connected to the drill collar wall. The heating element 31 end is the hot end 40, and the drill collar wall end is the cold end 50. In this way, a heat flow path is established through the heat conduction cable 10, and the heat dissipated during the operation of the heating element 31 is timely transferred to the drill collar wall through the heat conduction cable 10.

[0036] For this connection structure, the length of the heat conducting plate 13 on the heat conducting cable 10 should be as short as possible to reduce the distance for heat to pass through the heat conducting cable 10, thereby reducing the thermal resistance and fully ensuring the heat conduction performance of the heat conducting cable 10. Through this active cooling method, the operating temperature of the electronic components in the circuit cabin is controlled within a reasonable range, ensuring the efficient operation of the measurement-while-drilling instruments in the circuit cabin without failure or damage.

[0037] In one embodiment, first refer to Figure 1 , in Figure 1 In the planning schematic diagram shown, specifically, it mainly includes two major parts: the hot end 40 and the cold end 50. The hot end 40 is the circuit board 30 and electronic components in the circuit cabin; the cold end 50 is the drill collar wall surface. The hot end 40 and the cold end 50 are connected by the heat conducting cable 10. When the electronic components are working, the electronic components will gradually heat up, causing the overall temperature of the hot end 40 to rise. At this time, the temperature of the hot end 40 is much higher than that of the cold end 50. The heat conducting cable 10 will quickly conduct the heat generated by the operation of the hot end 40 to the cold end 50, thereby reducing the operating temperature of the electronic components and ensuring the normal operating state of the electronic components.

[0038] Refer to Figure 2 again. In Figure 2 In the schematic diagram of the positional relationship, the measurement-while-drilling instrument circuit cabin is arranged by grooving on the outer wall surface of the drill collar tool. There is a small cabin in the circuit cabin, forming a circuit board placement groove 23. The circuit board placement groove 23 is used to place the circuit board 30 required for measurement-while-drilling. The specific dimensions of the small cabin are designed with reference to the dimensions of the circuit board 30. The heat conducting cable 10 will be arranged according to the specific positions of the electronic components on the circuit board 30, and the position close to the drill collar wall is selected to fix the heat conducting cable 10, so that the length of the heat conducting plate 13 in the heat conducting cable 10 is minimized.

[0039] Refer to Figure 3 again, which is used for heat conduction of the heat conducting cable 10 in an environment with large restrictions on the internal space of the circuit cabin. By setting a plurality of circuit cabin grooves 22 on the circuit cabin body 20, the circuit cabin grooves 22 are flush with the small cabin in the height position, and are used to place the heat conducting cable connectors 11 and are fixed to the connectors of the heat conducting cable 10. Since the positions of the electronic components on the circuit board 30 are staggered from the positions of the grooves, in this embodiment, a heat conducting plate 13 material with a special-shaped customized structure is adopted. The structure and dimensions of the heat conducting plate 13 are designed and processed according to the relative positions of the heating element 31 and the circuit cabin grooves 22, and then connected to the two ends of the connectors to form a special-shaped heat conducting cable 10, which is fixedly connected to the electronic components of the heat source and the circuit cabin grooves 22 respectively.

[0040] Figure 3The position of the circuit compartment grooving 22 is affected by the position of the circuit compartment bolt hole 21. The function of the circuit compartment bolt hole 21 is to connect the circuit compartment housing 20 and the upper cover plate of the circuit compartment, thereby isolating the inside of the circuit compartment from the external environment and preventing the circuit board 30 and electronic components in the circuit compartment from being affected by the intrusion of high-temperature and high-pressure fluids from the outside during the drilling process and failing or being damaged.

[0041] Refer to Figure 1 the planning schematic diagram, Figure 2 the schematic diagram of the positional relationship, and Figure 3 the schematic diagram of the positional relationship, Figure 2 and Figure 3 In, the heating element 31 and the circuit board 30 in it are the heat sources, and the housing is the cold source, so that the specific direction of heat conduction in the circuit compartment can be determined. The two ends of the heat conduction cable 10 are respectively connected to the heating element 31 on the circuit board 30 and the circuit compartment housing 20, transferring the heat generated by the operation of the components in the heat source to the housing of the cold source to quickly cool down the heat source.

[0042] As Figure 4 shown, for the case where there is sufficient internal space in the circuit compartment, the heat conduction cable 10 connecting the hot end 40 can be directly connected to the drill collar wall. In order to ensure good heat conduction of the heat conduction cable 10 and at the same time keep the temperature difference between different electronic components on the circuit board 30 within a small range, a heat conduction plate 13 with a relatively complex structure can be customized in a special shape and supplemented with multiple joints to connect to the housing. For such a structure of the heat conduction plate 13, the heat conduction plate 13 and each electronic component are connected through high-temperature-resistant materials such as thermal glue or high thermal conductivity silicone grease to transfer the heat generated when the electronic components work to the cold end 50 more evenly.

[0043] At the same time, in the early-stage circuit board 30 structure design, relevant information on the positions with higher temperatures on the circuit board 30 can be obtained, and the heat conduction cable 10 is also installed at these positions to connect to the housing, ensuring that the board temperature of the circuit board 30 is also at a relatively low level and improving the overall safety of the circuit board 30 and electronic components during downhole operation.

[0044] Figure 5 shows the overall structure schematic diagram of the heat conduction cable 10. The heat conduction cable 10 mainly includes joints and a flexible heat conduction plate 13. For the flexible heat conduction plate 13 part, according to the specific heat generation situation of the hot end 40, the number of layers of the heat conduction plate 13 is selected, and the heat conduction performance of the heat conduction cable 10 is changed by the way of stacking multiple flexible heat conduction plates 13 to fully adapt to different situations to balance the heat conduction performance and economy of the heat conduction cable 10. For the joint part, it can be designed and replaced separately according to the specific connection method; at the same time, the multiple flexible heat conduction plates 13 can be fixed in position to prevent the heat conduction plates 13 from falling or slipping.

[0045] For Figure 5The heat conducting plate 13 therein must have the ability to quickly conduct the heat on the object in contact with it, that is, a high heat conducting material must be selected. In this embodiment, the selected material is a graphene high heat conducting material. Through processes such as high temperature and high pressure pressing of the graphene material, the heat conducting plate 13 suitable for the rapid heat transfer between the hot end 40 and the cold end 50 of the circuit cabin is obtained, and further the heat conducting cable 10 for the circuit cabin suitable for ultra-high temperature environment drilling is obtained.

[0046] Refer to Figure 3 the schematic diagram of the positional relationship, Figure 4 the schematic diagram of the positional relationship and Figure 5 the schematic diagram of the overall structure of the heat conducting cable 10. For the joints of the heat conducting cable 10, different fixing methods are selected according to the different connection positions. For the connection between the joint and the electronic component, through the methods of thermal glue bonding or side hole drilling, it can ensure the full contact and fixation between the heat conducting cable 10 and the electronic component; for the connection between the joint and the circuit board 30, it is fixed by drilling holes; for the connection between the joint and the cabin body, the joint bolts shown in the figure are used, and the connection is fixed by drilling holes in the cabin body.

[0047] The working principle of the heat conducting cable assembly for the circuit cabin heat conduction in ultra-high temperature environment of the present invention is briefly described below with reference to the accompanying drawings.

[0048] Through long-term development, the measurement-while-drilling technology has formed a series of relatively mature products and achieved remarkable application effects. However, the existing measurement-while-drilling equipment has insufficient temperature tolerance under ultra-high temperature conditions (above 220°C) and is prone to failure. Obtaining downhole engineering parameters in real time through the measurement-while-drilling tool is the most effective means to accurately master the wellbore information. The measurement-while-drilling tool is usually placed near the drill bit to continuously measure the bottom hole engineering parameters. At present, the temperature measurement range of foreign measurement-while-drilling tools has exceeded 200°C, but domestic tools can only meet the measurement in conventional high temperature environments (150°C). With the continuous deepening of exploration and development work, the existing measurement-while-drilling tools are very likely to fail or be damaged under the ultra-high temperature conditions at the bottom of the well; at the same time, due to the high cost of the measurement-while-drilling tool, once the measurement chip fails or is damaged, it may lead to the scrapping of the entire measurement-while-drilling equipment, increasing the drilling economic cost.

[0049] The present invention relates to the overall design of the assembly and structure of high thermal conductivity materials for measurement while drilling tools in ultra-high temperature (200°C) environments, mainly including the structural design of the thermal cable 10, the specific connection method, fixing method and structural design of the thermal cable 10 and the heating area, and its potential application scenarios include fields such as oil and natural gas drilling and completion and geothermal well development. The main content of the present invention covers the material selection, structural design and connection and fixing method of the thermal cable 10 on the circuit board 30 and the electronic components on the circuit board 30 in the measurement while drilling circuit cabin during the drilling process, which plays a vital role in quickly conducting working heat and avoiding heat accumulation. Through the research and development of this invention, the core technology of rapid heat conduction of the measurement while drilling circuit cabin measurement tool in the wellbore under ultra-high temperature environment has been independently mastered, breaking through technical barriers and greatly reducing external technology dependence.

[0050] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat conduction cable assembly for heat conduction of a circuit cabin in an ultra-high temperature environment, characterized in that, it includes a plurality of heat conduction cables (10), and the heat conduction cables (10) have heat conduction plates (13) and a pair of heat conduction cable connectors (11); the heat conduction cable connector (11) at one end of the heat conduction plate (13) is fixedly connected to the heating element (31) in the circuit cabin; the heat conduction cable connector (11) at the other end of the heat conduction plate (13) is fixedly connected to the drill collar wall closest to the heating element (31); wherein, the heat conduction plate (13) is a multi-layer structure and has a plurality of layers of heat conduction sheets, and the multi-layer heat conduction sheets are stacked and fixed to form the heat conduction plate (13) to meet different heat conduction rate requirements.

2. The heat conduction cable assembly for heat conduction of a circuit cabin in an ultra-high temperature environment according to claim 1, characterized in that, the heat conduction rate of a single layer of the heat conduction sheet ≥ 1000W / mK.

3. The heat conduction cable assembly for heat conduction of a circuit cabin in an ultra-high temperature environment according to claim 1, characterized in that, the heat conduction plate (13) is a flexible plate with a special-shaped structure.

4. The heat conduction cable assembly for heat conduction of a circuit cabin in an ultra-high temperature environment according to claim 1, characterized in that, the heat conduction cable (10) further includes a fixing device (12), the fixing device (12) is hot glue or high thermal conductivity silicone grease, and the heat conduction cable (10) is fixed to the heating element (31) or fixed to the circuit board (30) where the heating element (31) is located by hot glue.

5. The heat conduction cable assembly for heat conduction of a circuit cabin in an ultra-high temperature environment according to claim 1, characterized in that, the heat conduction cable (10) further includes a fixing device (12), the fixing device (12) is a bolt, and the heat conduction cable (10) is connected to the circuit board (30) in the circuit cabin through the bolt.

6. The heat conduction cable assembly for heat conduction of a circuit cabin in an ultra-high temperature environment according to claim 1, characterized in that, the length of the heat conduction plate (13) is the shortest distance between the corresponding heating element (31) and the drill collar wall.

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